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How to Use Multiple Buttons on a Single Arduino Pin – Smart Pin-Saving TrickRunning out of GPIO pins? Learn how to connect multiple buttons to just one Arduino pin using clever wiring and resistor ...
After this tedious step, he designed a PCB that hosts an Arduino Nano to accept input, two MCP23017 GPIO expanders to give it enough outputs, and CD4066BE CMOS switches to trigger the connections.
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